689554221 has 16 divisors (see below), whose sum is σ = 991859904. Its totient is φ = 424496384.

The previous prime is 689554219. The next prime is 689554223. The reversal of 689554221 is 122455986.

It is an interprime number because it is at equal distance from previous prime (689554219) and next prime (689554223).

It is a cyclic number.

It is not a de Polignac number, because 689554221 - 2¹ = 689554219 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689554223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124851 + ... + 130256.

It is an arithmetic number, because the mean of its divisors is an integer number (61991244).

Almost surely, 2^689554221 is an apocalyptic number.

It is an amenable number.

689554221 is a deficient number, since it is larger than the sum of its proper divisors (302305683).

689554221 is a wasteful number, since it uses less digits than its factorization.

689554221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255180.

The product of its digits is 172800, while the sum is 42.

The square root of 689554221 is about 26259.3644439465. The cubic root of 689554221 is about 883.4652540920.

It can be divided in two parts, 6895 and 54221, that added together give a palindrome (61116).

The spelling of 689554221 in words is "six hundred eighty-nine million, five hundred fifty-four thousand, two hundred twenty-one".